Anti-diabetic action of 7-O-galloyl-D-sedoheptulose, a polyphenol from Corni Fructus, through ameliorating inflammation and inflammation-related oxidative stress in the pancreas of type 2 diabetics.

Abstract

Compelling evidence indicates that polyphenolic antioxidants show protective effects against diabetic complications. We investigated the effects of a polyphenolic compound, 7-O-galloyl-D-sedoheptulose (GS), from Corni Fructus on a type 2 diabetic db/db mouse model. After 6 weeks of GS treatment, the effects of GS on serum and pancreatic biochemical factors were investigated. To define the underlying mechanism of these effects, we examined several key inflammatory markers, and inflammation-related oxidative stress markers. The results showed that levels of glucose, leptin, insulin, C-peptide, resistin, tumor necrosis factor-α, and interleukin-6 in serum were down-regulated, while adiponectin was augmented by GS treatment. In addition, GS suppressed reactive oxygen species and lipid peroxidation in the pancreas, but increased the pancreatic insulin and pancreatic C-peptide contents. Moreover, GS modulated protein expressions of pro-inflammatory nuclear factor-kappa Bp 65, cyclooxygenase-2, inducible nitric oxide synthase, c-Jun N-terminal kinase (JNK), phospho-JNK, activator protein-1, transforming growth factor-β1, and fibronectin. Based on these results, we conclude that a plausible mechanism of GS's anti-diabetic action may well be its anti-inflammatory property and anti-inflammatory-related anti-oxidative action. Thus, further investigation of GS as an effective anti-diabetic treatment for type 2 diabetes is warranted.

• Authors: Chan Hum Park, Takashi Tanaka, Takako Yokozawa
• Journal: Biological & pharmaceutical bulletin (Biol Pharm Bull) Vol. 36 Issue 5 Pg. 723-32 ( 2013) ISSN: 1347-5215 [Electronic] Japan
• PMID: 23412668 (Publication Type: Journal Article)

Chemical References

• 7-O-galloyl-D-sedoheptulose
• Anti-Inflammatory Agents
• Blood Glucose
• C-Peptide
• Cytokines
• Fibronectins
• Heptoses
• Hypoglycemic Agents
• Insulin
• Reactive Oxygen Species
• Thiobarbituric Acid Reactive Substances
• Transcription Factor AP-1
• JNK Mitogen-Activated Protein Kinases

Topics

• Animals
• Anti-Inflammatory Agents (pharmacology, therapeutic use)
• Blood Glucose (analysis)
• C-Peptide (metabolism)
• Cornus
• Cytokines (metabolism)
• Diabetes Mellitus, Type 2 (drug therapy, metabolism, pathology)
• Disease Models, Animal
• Fibronectins (metabolism)
• Heptoses (pharmacology, therapeutic use)
• Hypoglycemic Agents (pharmacology, therapeutic use)
• Insulin (metabolism)
• JNK Mitogen-Activated Protein Kinases (metabolism)
• Male
• Mice
• Oxidative Stress (drug effects)
• Pancreas (drug effects, metabolism, pathology)
• Reactive Oxygen Species (metabolism)
• Thiobarbituric Acid Reactive Substances (metabolism)
• Transcription Factor AP-1 (metabolism)